Clamp



FIG. 1 is a perspective view of a clamp, showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines depict portions of the clamp that form no part of the claimed design. 

I claim the ornamental design for a clamp, as shown and described. 